Grammar
GRAM'MAR, noun [Latin grammatica; Gr. a letter, to write.]
1. In practice, the art of speaking or writing a language with propriety or correctness, according to established usage.
As a science, grammar treats of the natural connection between ideas and words, and develops the principles which are common to all languages.
2. A system of general principles and of particular rules for speaking or writing a language; or digested compilation of customary forms of speech in a nation; also, a book containing such principles and rules.
3. Propriety of speech. To write grammar we must write according to the practice of good writers and speakers.
GRAM'MAR, verb intransitive To discourse according to the rules of grammar
GRAM'MAR, adjective Belonging to or contained in grammar; as a grammar rule.